Issue 1, 2020

Pyrene–viologen complexes in SDS micelles: quenching parameters and use as probes of aggregation numbers

Abstract

Through a formal-kinetic treatment, we rigorously derive the micellar occupations in the presence of fluorophore–quencher ground-state complexes and the resulting expressions for the time-dependent and stationary observables in the case of combined static and dynamic quenching. We present a protocol for data analysis that effectively isolates the processes, thereby ensuring rapid fit convergence and unique parameter sets. By this approach, we interpret time-resolved fluorescence measurements on pyrene quenched by a homologous series of viologens in SDS micelles. The dynamic intramicellar quenching is diffusion limited; and the formation of the ground-state complexes is entropy driven, with a constant increment per methylene group in the viologen sidechains. The micellar aggregation numbers are obtained with a precision comparable to neutron scattering, including their temperature dependence.

Graphical abstract: Pyrene–viologen complexes in SDS micelles: quenching parameters and use as probes of aggregation numbers

Article information

Article type
Paper
Submitted
09 Nov 2019
Accepted
10 Dec 2019
First published
11 Dec 2019

Photochem. Photobiol. Sci., 2020,19, 71-79

Pyrene–viologen complexes in SDS micelles: quenching parameters and use as probes of aggregation numbers

T. Kohlmann and M. Goez, Photochem. Photobiol. Sci., 2020, 19, 71 DOI: 10.1039/C9PP00439D

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